The Transparent color space behaves uniquely in that it preserves the matte channel of the image if it exists.
The -colors or -monochrome option is required for this option to take effect.
%b file size %d directory %e filename extention %f filename %h height %m magick %p page number %s scene number %t top of filename %w width %x x resolution %y y resolution \n newline \r carriage return
For example,
-comment "%m:%f %wx%h"
0 No disposal specified. 1 Do not dispose. 2 Restore to background color. 3 Restore to previous.
-label "%m:%f %wx%h"
11x17 792 1224 Ledger 1224 792 Legal 612 1008 Letter 612 792 LetterSmall 612 792 ArchE 2592 3456 ArchD 1728 2592 ArchC 1296 1728 ArchB 864 1296 ArchA 648 864 A0 2380 3368 A1 1684 2380 A2 1190 1684 A3 842 1190 A4 595 842 A4Small 595 842 A5 421 595 A6 297 421 A7 210 297 A8 148 210 A9 105 148 A10 74 105 B0 2836 4008 B1 2004 2836 B2 1418 2004 B3 1002 1418 B4 709 1002 B5 501 709 C0 2600 3677 C1 1837 2600 C2 1298 1837 C3 918 1298 C4 649 918 C5 459 649 C6 323 459 Flsa 612 936 Flse 612 936 HalfLetter 396 612
0: none 1: sub 2: up 3: average 4: Paeth
The optional mask can be used to provide matte information for composite when it has none or if you want a different mask. A mask image is typically grayscale and the same size as composite. If the image is not grayscale, it is converted to grayscale and the resulting intensities are used as matte information.